import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))

# list 多重リスト生成
def dlist(*l, fill=None):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]
n,c = list(map(int, input().split()))
l = list(map(int, input().split()))
w = list(map(int, input().split()))
index = list(range(n))
index.sort(key=lambda i: w[i])
l = [l[i] for i in index]
w = [w[i] for i in index]
inf = 10**12
dp = dlist(51,51,c+1,fill=-inf)
dp[0][0][0] = 0
ans = 0
for k in range(c+1):
    for i in range(51):
        for j in range(51):
            val = dp[i][j][k]
            for ii in range(n):
                ll = l[ii]
                ww = w[ii]
                if ww+k>c:
                    break
                if ll==i or ll==j:
                    continue
                if i!=0 and j!=0:
                    if (j-i)*(ll-j)>0:
                        continue
                    ans = max(ans, val+ll)
                dp[j][ll][ww+k] = max(dp[j][ll][ww+k], val+ll)
#     print(dp)
print(ans)